Family name Castellaro (Castellaro 
) , across the world, is quite a rare surname. The last name Castellaro is habitual in Italy, where it is quite a rare surname, Argentina, where it is a rare surname, and Bolivia. In absolute terms, it is the most numerous in Italy, Argentina, and Chile. Very seldom, Castellaro is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Castellaro | Argentina, France, Bolivia, Italy, Chile |
| marco castellaro researcher |
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| fabrizio castellaro mineral collector; he discovered castellaroite, balestraite, cerchiaraite-(Fe) and lavinskyite-1M |
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| justin castellaro Australian rugby league footballer, AU (b. 1990) |
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| lucia castellaro |
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Mr, Neli, Elio, Ella, Elsa, Elma, Elba, Elda, Edda, Erio, Enzo, Hugo, Irma, Ivan, Olga, Omar, Maria, Mario, Marta, Marco, Mateo, Maira, Nick, Mirta, Juan, Luis, Ana, Luu, Ena, Marc, Mara, Sara, Alex, Alan, Aldo, Anna, Ceci, Belu, Pier, Raul, Dora, Gaia, Gian, Gino, Glen, Lisa, Luca, Jose, and Mirco